Basis of Classification — NEET Biology MCQs with Solutions
Free NEET Biology Basis of Classification MCQs with step-by-step solutions (6 questions). Part of Animal Kingdom. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Basis of Classification · easy · theory
Animals with a body cavity lined by mesoderm on both sides are called:
A. Pseudocoelomates
B. Acoelomates
C. Coelomates ✓ Correct
D. Diploblastic
Solution: A true coelom is lined by mesoderm; acoelomates lack it and pseudocoelomates have a mesoderm not fully lining the cavity.
Q2 — Basis of Classification · easy · theory
An animal that can be divided into two equal halves by any plane passing through the centre shows:
A. Radial symmetry ✓ Correct
B. Metamerism
C. Asymmetry
D. Bilateral symmetry
Solution: Radial symmetry (e.g. Cnidaria, echinoderm adults); bilateral means only one plane divides it into mirror halves.
Q3 — Basis of Classification · medium · theory
Cnidarians and ctenophores are said to be diploblastic, meaning their body is made of:
A. Two germ layers (ectoderm and endoderm) with mesoglea between ✓ Correct
B. One germ layer
C. No germ layers
D. Three germ layers
Solution: Diploblastic animals have ectoderm and endoderm with an undifferentiated mesoglea in between; triploblastic have a true mesoderm.
Q4 — Basis of Classification · medium · theory
The presence of a notochord at some stage is the defining feature of:
A. Arthropods
B. Chordates ✓ Correct
C. All coelomates
D. Annelids
Solution: A notochord (dorsal supporting rod) at some stage defines Chordata; non-chordates never have one.
Q5 — Basis of Classification · hard · theory
True segmentation (metamerism), where the body is serially divided both externally and internally, is FIRST clearly seen in:
A. Platyhelminthes
B. Porifera
C. Coelenterata
D. Annelida ✓ Correct
Solution: Annelids show true metameric segmentation; arthropods and chordates also show it, but it appears first in annelids.
Q6 — Basis of Classification · hard · theory
Which sequence correctly lists the grade of body organisation in increasing complexity?
A. Organ-system → organ → tissue → cellular
B. Tissue → cellular → organ-system → organ
C. Organ → tissue → cellular → organ-system
D. Cellular → tissue → organ → organ-system ✓ Correct
Solution: Porifera show cellular level; coelenterates tissue level; platyhelminths organ level; from Aschelminthes upward organ-system level.